za3k.com is written in a combination of HTML and markdown, using vim.
za3k.com is managed with the version control system, git, and uses a git server hook to check out commits to the correct place to be served. The source is mirrored on github (another git server hook).
I use ruby's redcarpet gem to process markdown into HTML.
The server runs on one of prgmr.com's xen servers as a guest, using Debian. The server is nginx. The source for my server setup in managed in fabric.